| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Austenite Formation and Decomposition V: A Symposium in Memory of Prof. Mats Hillert
|
| Presentation Title |
Quenching and Austenite Reversion-Treated Medium Mn Steel Containing Various Precipitates |
| Author(s) |
Jinkyung Kim, Yong-Su Lim |
| On-Site Speaker (Planned) |
Jinkyung Kim |
| Abstract Scope |
Quenching and austenite reversion treatment (ART) of medium Mn steels leads to transformation from martensite to austenite, thereby forming a microstructure consisting of tempered martensite and austenite. The present study investigated the ART-processed medium Mn steel containing various precipitates (NiAl B2 and VC). The microstructures and mechanical properties of materials annealed for 1 hour at 620 °C and 680 °C were compared. The material annealed at 680 °C exhibited a remarkably large austenite volume fraction (approximately 70%). Increasing annealing temperature resulted in an increase in the width of austenite grains and a decrease in the amount of austenite stabilizing elements (C, Mn, and Ni). The material annealed at 680 °C exhibited superior strength-ductility balance, i.e. ultimate tensile strength exceeding 1.3 GPa and total elongation larger than 30%, resulting from gradual transformation-induced plasticity effect during deformation. We discuss the microstructure-mechanical properties relationship by considering phase-specific deformation mechanisms. |